Latent office



(No Model.) 8 2 Sheets-Sheet 1.

H. M. HOFFMAN. SBGTIONAL BOILER.

No. 568,198. Patented Sept. 28, 1896.

A-WITNEIEEEE- (No Model.) 2 Sheets-Sheet 2 H. HOFFMAN. SEGTIONAL BOILER.

Patented Sept. 22, 1896.

%WZM

" UNITED STATES P TENT Onricn.

HENRY M. HOFFMAN, OFBALTIMORE, MARYLAND, 'ASSIGNOR TO i FRANKO. SINGER;or sAMErLAcn SECTIONAjL BOILER.

SPECIFICATION forming part of Letters Patent No. 568,198, datedSeptember 22, 1896.

Application filed April 15, 1896.

To all whom it mag concern.-

Be it known that I, HENRY M. HOFFMAN, of the city of Baltimore, andState of Maryland, have invented certain Improvements 5 in SectionalBoilers to be Used in Hot water Heating, of which the following is aspecification. i

This invention relates to certain improvements in boilers for theabove-named purpose, which are built up of cast-iron sections placedface to face and intcriorly connected by manifolds, pipes, and nipples,so as to admit of the free passage of water from one section to another.

. The said invention consists in certain pe culiarities in theconstruction of the said sections, as will hereinafter fullyappear.

In the description of the said invention which follows reference is madeto the accompanying drawings, forming a part hereof, in which- Figure 1is an exterior front View of the improved sectional boiler. Fig. 2 is asection of Fig. 1, taken on the dotted line 00 at. Fig. 3

5 is a front view of the front or first section of the boiler. Fig. 4:is a similar view of one of the intermediate sections. Fig. 5 is asimilarview of the rear section. Fig. 6 is a crosssection of Fig 5,taken on the dotted line y y. Fig. 7 is a section of Fig. 4, taken onthe dotted line 2 2. Fig. 8 is a side view of the lower part of the legof any one of the sections. Fig. 9 isa cross-sectionof a part of theboiler, as hereinafter described.

Referring now to Figs. 2 and 3 of the drawings, in which are shown,respectively a vertical section and an interior front view of the firstor front section'of the boiler, A A are the hollow legs, connected atthe top by the hollow crown B and below the crown by the hollow centralplate 0, which contains the furnace or fire-box door opening D. Thecentral portion or hollow plate 0 is united to the crown B by the pipeCb. In cross-section the legs A are oval or elliptical, and the upperwall of the crown is of a curvature corresponding with that of the wallsof the legs. The lower wall of the crown is semicircular, as shown inFig. 2. O is of the same curvature as that of the walls of the legs, butthe lower one is fiat and The upper wall of the hollow plate seen No.587,601. (No model.)

forms the upper edge of the ash-pit opening.

The portion of the front section above the hollow plate 0 isconsiderably thicker than or elliptic in cross-section and the one, 6,circular. The pipes c and d are in communication with the crown by meansof the branch pipes f and g, which are elliptic in cross-see tion. Thepipes cl and c are in communication by means of the tapering branches h,which are of elliptic cross-section. (See Fig. 9.) The tapered branchesh, of which there are a large number, stand apart, as shown in Fig. 4,and occupy, with their intervening spaces, the entire width between thelegs A.

Referring now to Figs. 2 and 5, it Will be seen that in the rear sectionof the boiler the legs and crown correspond in shape with those of theother sections. It also has the upper wall on of the pipe 0 of theintermediate sections and the branch pipe f. The lower part of the rearwall of this section is not hollow, but consists of a single wall '6,which forms the rear end of the ash-pit. From this point to the upperwall on the plate is hollow and the two walls j and 70 thereof arecorrugated and the wall 70 is flared inward to join the wall m. standapart, there being a fiat space n be tween them, (see Fig. 6,) whilethose of the wall j come together. The object in separating thecorrugations of the wall la is to increase the heating-surface at thatpart of the boiler. The various sections as described are placed face toface, as shown in Fig. 2, and the front and rear plates II and I placedagainst them, the whole being secured by bolts 0, which pass throughlugs 19.

In the front plate II are the cleaning-doors J, the fire-box door K, andthe ash-pit doors L. The rear plate Ihas the smoke-conn ection Thecorrugations of the wall 70 nozzles M, and to provide a space betweenthe rear section and the smoke-nozzles the rear plate I is dished oroffset, as shown in Fig. 2.

It will be seen by reference to Fig. 2 that the curved pipes 0 separatethe space between the crown and the pipes d into two compartments 0 andP, through which the products of combustion from the fire-box pass tothe chimney-nozzles M, as shown by the arrows in Fig. 2.

The legs of the sections of the boiler are thrown in from the point oftheir junction with the curved pipes e to the points g, which are aboutin alinement with the upper surfaces of the grate-bars Q. Thisconstruction gives an unusual width of furnace for a contracted width ofgrate-surface and effects considerable economy in fuel.

The grate-bars Q are of the rocking description, and their ends enterlugs 1" on the innersurface of the sections. The grate-bars havetailpieces 8, having pins t, which are connected by a rod 10, leading tothe front of the boiler, where it is provided with a shaking-bar o, towhich a handle may be applied.

R is a manifold having nipples w, screwed into the crowns of thesections and from which extend the pipes (not shown) to convey hot waterto the various apartments of the building to be heated.

S S are manifolds at the sides of the boiler, connected at the rear endby a pipe T, which extends across the outside of the boiler. To thispipe the return or cool-water pipes (not shown) are led. The sidemanifolds are united to each section by nipples. (Shown in dotted linesin Fig. 2.)

I claim as my invention 1. In a sectional boiler, the intermediatesections thereof having the expanded legs,and the curved crown, combinedwith the curved concentric pipes connected by branches, and the twolower pipes connected by a series of separated tapering pipes,substantially as specified.

2. In a sectional boiler, the rear section thereof having the expandedlegs, connected by a curved crown and a corrugated hollow plate theupper end of which is united to the crown by a pipe and terminating atthe lower end in a single wall which serves as the rear side of theash-pit, substantially as specified.

HENRY M. HOFFMAN. lVitnesses:

WM. T. HOWARD, DANL. FISHER.

